Network 版 (精华区)
发信人: zzn (爱你到内伤), 信区: Network
标 题: mms协议英文资料(16)
发信站: 哈工大紫丁香 (2003年08月23日10:54:47 星期六), 站内信件
20 To Client
Prefix 1 00 00 00 00 – ErrorCode
Prefix 2 ff 00 00 00 – unknown
This command is rarely seen, but when it does appear it behaves like a ‘media
changing’ indicator. It normally follows a 1E command (stop), then the 20
command (change), then a new ASF header object is sent describing the new
media file or stream that follows. The MMS protocol then continues with the
07 to server and 05 to client commands as normal. Then media packets follow
for the new media.
After prefix data the command structure follows as below.
Ec 05 00 00 ?? Ee 01 00 00 ?? 11 ff 00 00 ?? 00 00 00 00 ??
We need to understand this structure more fully and the data values shown in
it.
21 To Client
Prefix 1 00 00 00 00 - ErrorCode
Prefix 2 02 00 00 00 - reflects the header PacketIDType value
Stream selection (command 0x33) acknowledgement.
28 To Server
Prefix 1 01 00 00 00 - CommandLevel
Prefix 2 ff ff 01 00
Then structure below
Sent from media player while activating the FF or RW seeking buttons.
8 bytes for double precision Time Point 8 bytes 0xff unknown 4 bytes unknown
4 bytes shows media ‘PacketIDType’ 8 bytes unknown could be a double
precision value
As you can see, not much is known about this command, but this is the basic
structure and hopefully more data will become available.
30 To Server
Prefix 1 01 00 00 00 - CommandLevel
Prefix 2 33 00 00 00 - ??
Then structure below
Sometimes seen when the player stops, like an ACK for the 1E command, unsure
at this time.
00 00 00 00 18 00 00 00 0c 01 00 00 – sometimes this shows the stop time C9
00 00 00 Ca 00 00 00
These values are unknown at this time.
17
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